Volume 40 Issue 6
Dec.  2022
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Article Navigation >  Journal of Transport Information and Safety  > 2022  >  40(6): 33-44
YANG Yajun, ZHANG Chi, TANG Xiang, QI Xin, ZHAO Yijing. An Optimization Method and Evaluation Model for Designing Speed Control Zones of Freeway[J]. Journal of Transport Information and Safety, 2022, 40(6): 33-44. doi: 10.3963/j.jssn.1674-4861.2022.06.004
Citation: YANG Yajun, ZHANG Chi, TANG Xiang, QI Xin, ZHAO Yijing. An Optimization Method and Evaluation Model for Designing Speed Control Zones of Freeway[J]. Journal of Transport Information and Safety, 2022, 40(6): 33-44. doi: 10.3963/j.jssn.1674-4861.2022.06.004
shu

An Optimization Method and Evaluation Model for Designing Speed Control Zones of Freeway

doi: 10.3963/j.jssn.1674-4861.2022.06.004
  • 1.

    School of Highway, Chang'an University, Xi'an, 710064, China

  • 2.

    College of Transportation Engineering, Chang'an University, Xi'an, 710064, China

  • 3.

    Guangxi Communication Design Group Co., Ltd, Nanning 530029, China

  • Received Date: 2022-04-23
    Available Online: 2023-03-27
    Abstract
  • The problems such as unreasonable determination of the speed limit, invalid rate-limiting way, and improper setting of speed limit range can impact the road safety. These problems can impact driving experience and the credibility of speed limit management. A model is developed based on safe speed and traffic efficiency. Then, the minimum length of speed limit zone, the limit of vehicle speed, and the division of speed limit zone are optimized. On this basis, an evaluation model of speed limit zone of freeway is optimized. The minimum length of the speed limit zone is calibrated according to the driver's vision recognition distance, the pre-setting distance of speed limit sign, and the driver's psychological stability distance. These limitations include the drivers' visual distance, the pre-setting distance of speed limit sign, and the drivers' psychologically stable distance. Then, according to whether the speed is prone to sudden change, a road segment is divided into six different types of combination by the method of variable length. On this basis, the speed limit prediction models of different combination roads are determined. The method based on partition and hierarchy in cluster analysis is used to optimize the partition of speed limit zone from two aspects. The minimum length of speed limit zone and the minimum traffic delay are optimized.At the same time, the traffic conflict rate is chosen as the index of traffic safety. And the traffic delay time is chosen as the index of traffic efficiency. The evaluation index model is established. Then, the validity of the method is verified by the comparison and analysis of the indexes before and after optimization. The simulation experiment of speed limit optimization is carried out on a mountain freeway with VISSIM. The results show that the parameters of the optimized safety evaluation model is reduced by about 29.49%. The parameters of the efficiency evaluation model is increased by about 21.90%. Moreover, the safety and overall traffic efficiency of the optimized freeway are improved. The speed limit zone determination method in this paper is based on the sudden change of the vehicle speed.This method combines the attribute and index characteristics of freeway sections. The proposed optimization method can significantly optimize the length of speed limit zone and the division of the zone.

     

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